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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38f20d4a7a4276504b2425237b00c797a637b6b2e8c917caf0e63d8b37bdba96' 
  AND token = '7Ihmw0P5AgiveQOy+eCouPRXtjVQWvs+8F+6qdWFe4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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