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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8be17e1fb8969d4a6bc4002194eb028bfd073b85a9f9db952da296b1b58c88a' 
  AND token = '/bvINPlawNM18DD9yz16pao95XxpsYwLOU5eNno9ao4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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