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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46ed84a997637230292de621c07493224518035b3d7e4abb39992e0d3ec5d506' 
  AND token = 'efNEP2u/HqszESauFeQ9lFqW23lzRy0zh4xstc+X5G8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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