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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59d7521f222ed8be33c5e2a3d9b82fc94f9cc30ebe154d4fe5a263eb558f6a9b' 
  AND token = 'rRFH89COkODHQc68WObFrToZSoGUWrvuy5WYI/CANVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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