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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6edd5ed1b3480ba16e7d8ee6b3113237e1fb638009b6310d63e10bc7e5f47e54' 
  AND token = 'G1i/aN4kPR+34An1/MpP/8lvj36gtkcHHsqis4+tz6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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