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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4af0997c61f239d854244a48808572d047c61a2e8fc3c479af0542af858dd480' 
  AND token = 'RCSS4qlOF3g8Rf7umZ2lqAZc3sHieibTLoqAIFSj77I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00106

JSON explain

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