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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96e60c435fe47d616f288c953c3d1f165fc82ae9690dcbeb0f8c5a2a4ec12859' 
  AND token = 'tEGm5JsgWc5FzHM/UQrfJc6oMa4jxX6fFpXyxlP4lrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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