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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0082fb0b99005b1bdcb697ecb1bf3af0c4ddf446a7973d7716ab5d05138bf773' 
  AND token = 'Nr2v3sX6+afXgdIJzV4U7m4KkbSc8l1OjlgcHCy1lyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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