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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a27b1db594bb8b2e526b2c7036ada3b9ee5a2406fa59b25f631dcc994e108c1f' 
  AND token = 'odKCAKQkIjWZ74cNrESmG7fm44tedGPIRMwHniupp5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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