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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d6cd1d4f19766e79a2fc206d54a0f25f17bba197d7da0b1ba2fb06598153d26' 
  AND token = 'FifIWMcwj80OJUorD5hjVF0qK9NkqysSiRmbbiiP08s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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