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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3f24859f1ff40c6a2ea1ccbd6101eb84a5a3d70d295ce4107f80ddc1c632588' 
  AND token = 'MsN9EqQVHPogtPX0wMoFJGRfcB7VyfRap7iy6Zamg2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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