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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54bf812c32a63d88a4de6620fafab3c0f8933e2165b025b3d979ee78f8c52e34' 
  AND token = 'T8YyoMss09f4t9HvBU3wp1dq6BxzPqFISSia2iSDf8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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