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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9794e2b0b08ab1cd8e086e4f107cee334fe8533cfeb4942db9fdd6ff3b3ec4e0' 
  AND token = 'QzUmu6g/ugM5KXh7sBFFysSDfFEdi0vyJXYWANQuJVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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