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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a06bfce9c982de5614d8ebcdcb3d2f9077de8033f41a88f3e02b9417770d56eb' 
  AND token = 'vmaxpqeI+tOvKK8CdENopRww4gbKYodytin8NjD2Jmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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