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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0526f04dedfa83b6cf10201ecb76b99985c6613485206d13e405c7a76c9bfad' 
  AND token = 'ER+lFenNmQ+qU4+VxDsb0wuV+AGXNzO6d4pO3HlNziE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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