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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccf247b23d59f930a2adbde50e295900ab52c6e5e48a00dde099bf7c8f9c94ea' 
  AND token = 'K14/ocmXEM3w1xVKF2p0zjDygiZb1Rf5quOS+Yrttrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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