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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '942e6e2bb7b5ef5a8c53ecdb5283649c2cfa8e3564e7d7529cb0f42225784c61' 
  AND token = 'ZPI9jgr1o9kKzqh41rS9kFdRNgx/1PwrC8ymt3fLf24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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