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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4e464cdb741cd3ddff0bc4829d8019e9c7fa4004436353e224dfd66072157f3' 
  AND token = 'XqSQgE5rHsOBxAhocK/3cB55oOM+P9Ep4xMGGREmuBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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