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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50e7fca2f99fcc481f6804941106cae5aabfbfa86fd37d3f011cc8bfc67d62b0' 
  AND token = '72AyIqwkklaHIX/0OPyPIAkIDrTyvAVorNU27dOWOEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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