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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc3f4594adfdda01f4f464aa43a3909752dc1c273db9fb6a8e27ded3d0aaff1f' 
  AND token = 'mMI+j+zkAnxH5RiXhLhlgL0VfeJkwcfTl7K0j1MG9hY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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