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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f8a60f9a7abb7d7087c62bdaffd80b3e216b146827bfae87b6ecbbeca25d288' 
  AND token = '52MM0dA4GJ0V3Am3q4wjVWzfs4AQAutx6zcij112pGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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