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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85b77c80173e687f01ab6f0ae50bf2a9888e38adf9c89357e9c77d347b3b87a0' 
  AND token = 'tBV9U2pPnIISCp9z+jMPL8netKrmAclaj8991w3THIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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