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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '560686cf7064b15a630cf3eeee664b7a2818ae176187383fea59d7329f3ba426' 
  AND token = 'QazhsIaRvcgRLpHSUoNZJ9p9cCeN1UI23Iusfx58bG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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