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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f20c094291c22a36f240288ee9f0d9d5db6da69890e05ef593406f5188e0cf2b' 
  AND token = '1aoocbG51WiGkYpNdl1X20WOvKjnigxnPkPGPeviQ5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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