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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08760507007b5409c8d36372e12cba1ee5a84987be167676551ed3613ac66e7a' 
  AND token = 'P2BjMkt5ff41lH6QcaHmYL0GJgc/li9wRCCDjEe3r1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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