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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d8d80728323c5ae2e5ac2ea2c63262dcd0ea9671b4cbb9d9782f264c88bd2a2' 
  AND token = 'H3AeqEtSY7zTIySdb5iMPXeCXM3T3agARi+6T6y523I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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