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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '176cfff7d1f9b923e64e524aa7d8300d9c4a043f9887b0171b5cd473524897f9' 
  AND token = 'kpeU6cDGcZzsS/IpJM6/Q2NfCc3BagrncZSg6A4HD3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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