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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e86db17acc536bcb592b01614d6bfe099a42661c586c42423cb492fceb14eb8' 
  AND token = '3PL0VI7qpW1yzSwLzKnxuebjj4TWEXuiSzwez3Sf0zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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