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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8285f8e12a4dce65d4be76c63eae58171320531780586344ddb88b1314725787' 
  AND token = 'f5Lyswb3AJlfa1kqrlXGOWFyqGO38p6FoHR1neakU9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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