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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4375693c3d895da54677b6679dc5c0514e0ac1502995fa993501512cfe72ddb' 
  AND token = 'WslrgDZr7TTO+thtU/3a9H4pEhB3FwKkatKEg8i3vDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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