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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beba810e1e0d591754d1ce04dc58594fd6a4a26c9d292f042e7f290c69b1ed10' 
  AND token = '/zRAtE50d4J41dZi2Z/8JJvr5nSNaftR+7cGhAGMeyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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