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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9d1bb414e152d592c35a49295180b0c5f2d79aaeb4643294f40b81d9e306051' 
  AND token = '4XqFYj2PNvY4TNfLyVewiLaAKulO5o0Sa7RPmaO+6P0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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