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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8b0eb580d9fd22b2573ae6e83f9c618455399dab6a98ae56c5f31cfdbfd59a3' 
  AND token = 'HnF+T1Q3mkOX5niszJQmo8zYKX6u7vKssn5EhE+eaks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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