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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c0635e2c3ffdb0f4d27461cdbb4da4270eec4b0c1c8dda0c68113deb4576f93' 
  AND token = 'jr+aSyA/hmYIMqi/qC3QWw4N6EUGN27fZ/79ySAYU30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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