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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8cf92130faff602990e53f88357fcb711d120730b7b00a1ad950d6c2c62578d' 
  AND token = 'rmtMiBC5lDMP6Q9ngPr6vLGW/KoW4hoXgPYfpsCF1l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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