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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a33aa578730baf5ab74e508ee22527c8f3d0627949e891700f0cb1bf9c31595b' 
  AND token = 'CJG/SGrkotcosq6spphLdYjvCuc1EW10db+7Y7XiPTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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