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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2239d2db961dea3f86a186ff468a36421b20942616dbd61671bbc8cbeec8318' 
  AND token = 'tk84p4SnomulQvQNBvCydZ0Rtie/X2O1Jq1XShcp3Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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