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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc9b3345b329cdbb6b9416efd6e77cdda9cde5278034d38ac695fc021785f392' 
  AND token = 'S7hrddbxIKTWJxxwyJzoZ+C43CGSxSXKDDFT7CiyLrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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