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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43974127ebc6aacd3926961d29776ad8a1814af3b2053b756722af2f95b09c81' 
  AND token = 'n0/rIAAXAdyrdkKi4VSmHrSxgUdHtTjk10MrWtevhS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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