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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeedd7d39d4c3fed1f2e9b2b9b9d8ba1b2c40dfda642e64864837d7d6a577591' 
  AND token = '9IcrPysaeLZUYCPb1AOBKMlylmbUi64io+G4cag97qI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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