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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf2cf18b4c2bfd172c65f8ead8bd01da994d0fbd9337491b96be5502044031fe' 
  AND token = 'JkDHAr2uw4suK3dIlrtYCd59Vvf2GpZDVeXYGyDepRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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