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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2caab1127b66ee6f28f2cbcebfe52caf8b097a7990f3d277dcc2424042878bc' 
  AND token = '+K6cQq7FLmsTlCxdAKPg0tXR1MqqdergTn1HxULJ4x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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