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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '710ee107b628864d5b1a9e36eb4c45b474011a93e64fb3b851f9d4afc38a09fc' 
  AND token = 'oSwz4uplsfr8DqaFIksBdw5ETt+7AgnkEwlJTo0yhwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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