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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b076b3edbc22f562d604ca92d715e5e679a92820fd63b90a1c2cd687183f9cad' 
  AND token = '/PN4xI9wXIVBusHInfwEGx2WkEfoNqQMdJQ6+Oep9RA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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