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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91bd36c1ca65f67e0e4789b2880b7b7558556cd7e0957b194c73e5208bc5dcee' 
  AND token = 'vAYEaZac90znSgMrWB+NXkV/3ivHZDcCQEPjCPhi2Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}